Hello macka,
I donít think you are going to get too much of an answer from anyone about Mr. Pass, Passlabs, or Threshold but what that can be found on the Internet. Mr. Pass keeps him self very busy. I have had the pleasure of meeting him two times and e-mailed him hundreds of times. He can talk theoretical , common sense, and diy circuit design impressively plus talk about the future of audio too.
I remember two different Stereophile articles he did. I think the early article he did might interested you, is were he talks about the early days of Threshold, The Claw speaker system and the Forte series of amps and preamps. In the latest article with Stereophile he talks about the design of the X-series amplifiers. I have been moving into a new house and (spending money like crazy) I would have to dig around to find the issues of the Stereophile magazines but you should be able to do a search on the Stereophile web page and find these issues. Also in the TAA issue 2/81 Citation 12 modification to mosfets, which I have built, he mentions that he worked at the ESS speaker company.
Maybe you can get an idea of his personality by looking at the Pass Labs ads. Notice no catch phrases, no distracting pictures that draw your attention away from the products, no cute loveable little cartoon creatures, and no big large printed words for a hard sell. And he does have a hard working group that supports him at Pass Labs too.

I'm leaving for 2 weeks of vacation on Saturday, so
I'll see what I can work up by way of a bio, since the
marketing dept keeps bugging me anyway.

I have a large number of boxes of brochures, papers,
reviews, articles, pictures, and stuff, and I've been
meaning to fill up a CD with JPEGS of it. When it's
done, we'll make it available for media and postage
cost.